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Why transistor has highest power gain?
the power gain is highest in Common emitter: This transistor configuration is probably the most widely used. The circuit provides a medium input and output impedance levels. Both current and voltage gain can be described as medium, but the output is the inverse of the input, i.e. 180° phase change.
What is hFE in a transistor?
hFE is an abbreviation, and it stands for “Hybrid parameter forward current gain, common emitter”, and is a measure of the DC gain of a junction transistor. So on a multimeter, it indicates a mode where the meter can measure (probably crudely), the HFE of a transistor.
What is a current gain in a transistor?
The current gain for the common-base configuration is defined as the change in collector current divided by the change in emitter current when the base-to-collector voltage is constant . Typical common-base current gain in a well-designed bipolar transistor is very close to unity. The most useful amplifier…
What is the current gain of a common emitter transistor?
The common emitter configuration has a current gain approximately equal to the β value of the transistor itself . However in the common collector configuration, the load resistance is connected in series with the emitter terminal so its current is equal to that of the emitter current.
How does transistor amplify a signal?
A transistor acts as an amplifier by raising the strength of a weak signal . The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. This forward bias is maintained regardless of the polarity of the signal. The below figure shows how a transistor looks like when connected as an amplifier.
What is the beta value of a transistor?
Typically, Beta has a value between 20 and 200 for most general purpose transistors. So if a transistor has a Beta value of say 100, then one electron will flow from the base terminal for every 100 electrons flowing between the emitter-collector terminal.